/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.meta.provider.datacatalog;



import com.google.cloud.datacatalog.Entry;

import com.bff.gaia.unified.sdk.extensions.sql.meta.Table;

import com.bff.gaia.unified.sdk.schemas.Schema;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableMap;



import java.net.URI;

import java.util.Map;



/** Common utilities to create Unified SQL tables from Data Catalog schemas. */

class TableUtils {



  interface TableFactory {

    Table.Builder tableBuilder(Entry entry);

  }



  private static final Map<String, TableFactory> TABLE_FACTORIES =

      ImmutableMap.<String, TableFactory>builder()

          .put("bigquery.googleapis.com", BigQueryUtils::tableBuilder)

          .put("pubsub.googleapis.com", PubsubUtils::tableBuilder)

          .build();



  static Table toUnifiedTable(String tableName, Entry entry) {

    if (entry.getSchema().getColumnsCount() == 0) {

      throw new UnsupportedOperationException(

          "Entry doesn't have a schema. Please attach a schema to '"

              + tableName

              + "' in Data Catalog: "

              + entry.toString());

    }



    String service = URI.create(entry.getLinkedResource()).getAuthority().toLowerCase();



    if (!TABLE_FACTORIES.containsKey(service)) {

      throw new UnsupportedOperationException(

          "Unsupported SQL source kind: " + entry.getLinkedResource());

    }



    Schema schema = SchemaUtils.fromDataCatalog(entry.getSchema());

    return TABLE_FACTORIES.get(service).tableBuilder(entry).schema(schema).name(tableName).build();

  }

}